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Full Discussion: How to shutdown Linux box with user confirmation?
Top Forums UNIX for Dummies Questions & Answers How to shutdown Linux box with user confirmation? Post 302896637 by hicksd8 on Tuesday 8th of April 2014 11:52:59 AM
Old 04-08-2014
When Corona688 says that the 'reboot' command is not interactive I think he means that it doesn't ask for confirmation. If you are root then that command (on most Unix flavors) will reboot the system (instantly) so prone to mistakes.

The 'shutdown' command is the standard way of doing it because you can specify a delay, send a warning to all logged-in users that the system is going down, etc. During the warning period the sequence could be interrupted if it was issued in error.

Another command you should be aware of is 'init' which changes the 'run level'.

Code:
 
 init 0

will close down the system

Code:
init 6

will reboot the system

Code:
init 5

will close down the system and power it off if your PSU supports it.

There are other 'run levels'; see the man page.

Most of the above relates to generic Unix speak. Depending on which flavour you're running, in my experience, 'init <run level>' is more likely to give you an orderly shutdown/reboot than the 'reboot' command.

'init' is the sysadmins short cut and NOT to be used by anyone else.
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LEARN ABOUT MINIX

reboot

REBOOT(2)							System Calls Manual							 REBOOT(2)

NAME

       reboot - close down the system or reboot

SYNTAX

       #define _MINIX_SOURCE 1

       #include <unistd.h>

       int reboot(int how, ...)

DESCRIPTION

       Reboot() is used to close down the system.  It allows several ways of shutting down depending on how:

       reboot(RBT_HALT)
	    Halt the system and return to the monitor prompt.

       reboot(RBT_REBOOT)
	    Reboot the system by letting the monitor execute the "boot" command.

       reboot(RBT_PANIC)
	    Cause a system panic.  This is not normally done from user mode, but by servers using the sys_abort() kernel call.

       reboot(RBT_MONITOR, code, length)
	    Halt the system and let the monitor execute the given code of the given length.  (code is of type char * and length of type size_t.)

       reboot(RBT_RESET)
	    Reboot the system with a hardware reset.

       Reboot() may only be executed by the super-user.

DIAGNOSTICS

       If the call succeeds, it never returns.	If something went wrong, the return value is -1 and an error is indicated by errno.

SEE ALSO

       shutdown(8), reboot(8), halt(8), sync(1).

NOTES

       Minix  can not return to the monitor if running in real mode, or if started from MS-DOS.  This means that most of the reboot functions will
       change to a reset.

AUTHOR

       Edvard Tuinder (v892231@si.hhs.NL)

																	 REBOOT(2)
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